Buffalo, N.Y. : W.S. Hein Co., 1990 2nd ed. Law Center Library: K3238.A1 I536 1990 Although no longer updated in print, this is a great volume that is still of use because it contains international human rights instruments that U.S. is a party to, treaties which U.S. has signed but not ratified, and treaties that U.S. has not signed. Reservations and Declarations are included as well as U.S. action along with a selected bibliography.
The Peace Agreements Digital Collection, part of the Margarita S. Studemeister Digital Library in International Conflict Management, strives to contain the full text of agreements signed by the major contending parties ending inter- and intra-state conflicts worldwide since 1989. It is a collection constantly under development by the Jeannette Rankin Library Program as a means to strengthen worldwide access to information on peaceful means to end international conflict.
This is a superb collection of human rights materials. The treaties collection is searchable by subject, country and keyword. Also look at the entire Human Rights Library which is an excellent electronic resource with more than 25,000 documents referenced.